Large focal length planar focusing of Dyakonov polaritons in hyperbolic metamaterial  

作　　者：Xiaoyu Xiong Yihang Fan Weipeng Wang Yongzheng Wen Zhengjun Zhang Jingbo Sun Ji Zhou 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China [2]Key Laboratory of Advanced Materials(MOE),School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Progress in Natural Science:Materials International》2024年第4期632-636,共5页自然科学进展·国际材料(英文版)

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFB3806000);National Natural Science Foundation of China(52332006)

摘　　要：Achieving subwavelength optical focusing is of great importance in nanophotonics.However,achieving focusing with both a small focal spot size and a large focal length remains elusive so far.Here,a large focal length planar focusing device is presented,utilizing highly oriented Dyakonov polaritons in hyperbolic metamaterial with periodic silver rings as the excitation source.Experimental results show that by controlling the size of the excitation sources,the focal length can reach 6λ_(0)(whereλ0is the illumination wavelength),and the focal spot size can be reduced toλ_(0)/10.This method provides new prospects for planar polariton optical applications.

关 键 词：Subwavelength optical focusing Dyakonov polaritons In-plane hyperbolic metamaterials Near-field optics 

分 类 号：O431.1[机械工程—光学工程] TB34[理学—光学]